The utility model relates to a pressing mechanism of a horizontal type adsorption tower. The pressing mechanism of the horizontal type adsorption tower has the technical characteristics that the pressing mechanism of the horizontal type adsorption tower comprises a pressing main body, a pressing rod, a pressing air cylinder body and an air cylinder intake assembly, wherein the pressing main body is fixedly arranged on a pressure container of the horizontal type adsorption tower, the pressing main body is filled with a molecular sieve, a pressing coir mat and a pressing sieve plate are sequentially arranged on the molecular sieve, the upper end and the lower end of the pressing rod are connected with the pressing sieve plate and a magnetic piston device respectively, the pressing air cylinder is arranged on the pressing main body, a magnetic ring sensing device is arranged at the outer side of the pressing air cylinder, the air cylinder intake assembly is arranged at the air inlet end of the pressing air cylinder, the air cylinder intake assembly, an air cylinder pressure gauge, a speed regulating valve and the air cylinder intake assembly are assembled together. According to the pressing mechanism of the horizontal type adsorption tower, the design is reasonable, the molecular sieve is pressed by the pressing air cylinder, a carbon molecular sieve in the adsorption tower can be in a pressing state all the time, the molecular sieve is ensured to be effectively used for a long time, and the pressing mechanism has the characteristics of stable performance, long service life and the like.